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Spindle Speed
Calculating the Correct Spindle RPM
1.
Figure 48
Recommended Cutting Speeds
Rough Cuts
Note: These values are based on HSS cutting
tools. For carbide cutting tools, double the aver-
age speed. These values are a guideline only.
Refer to the MACHINERY'S HANDBOOK for
more detailed information.
Figure 48.
2.
3.
Configuring the V-Belts and Back
Gear
Finish Cuts
To configure the V-belts:
1.
2.
BACK GEAR
Figure 49.
Note: For this step, you will need to aver-
age out the diameters or work with the finish
diameter for your calculations.
Cutting Speed (SFM) x 4
Spindle Speed =
Note: This chart is also on the front of the
headstock. The "Direct" speeds are with
the back gear disengaged. Instructions for
engaging the back gear are on Page 35.
B
A
1200
DIRECT
550
220
100
Diameter of Cut
Figure 49
/min.
900
655
410
300
165
120
75
50
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